Tabletop cutting device

ABSTRACT

Two 18V-type rechargeable batteries are attached in series so as to allow a 36V-type tabletop cutting device to be utilized. By utilizing the 18V batteries which are highly prevalent for electric tools, it is possible to use the 36V-type tabletop cutting device as well as to reduce costs for the batteries.

TECHNICAL FIELD

The present invention relates to a tabletop type cutting device whichincludes a rotary blade such as, for example, a circular grindstone, asaw blade, and a chip saw.

BACKGROUND ART

Japanese Laid-Open Patent Application No. 2010-173029 and JapaneseLaid-Open Patent Application No. 2007-83610 disclose techniques relatingto a tabletop type cutting device. The tabletop cutting device isprovided with a table for mounting a cutting material on the top surfacethereof and a cutting device main body which is supported above thetable and is operated to move vertically. The tabletop cutting deviceperforms cutting processing by moving the cutting device main bodydownward while rotating a rotary blade and then cutting the cuttingmaterial which is fixed on the table by using the rotary blade.

In recent years, electric tools such as an electric screwdriver and acutting tool etc. have generally become cordless. In the abovementionedtabletop cutting device, rechargeable batteries have been widely used asa power source. Without limiting the abovementioned tabletop cuttingdevice, batteries of which the output voltage is, for example, 18V or36V have been widely provided as batteries of the electric tool. Whenthe tool is a relatively small-sized and handheld tool and a low outputmodel, an 18V-output battery (18V battery) is mainly used, and when thetool is a relatively large-sized (high output) cutting tool whichrequires a higher output, a large-sized 36V-output battery (36V battery)is used.

SUMMARY OF INVENTION

However, an 18V battery cannot be used in a high-output cutting tool inwhich a 36V battery is used as a dedicated power source. Thus, a userhas to additionally prepare a 36V battery dedicated to the high-outputcutting tool. In this regard, there is a problem of high costs, andthere is a room to improve handling property of the high-output cuttingtool.

Therefore, an object of the present invention is to further improveconvenience and handling property of a cutting tool by allowing therelatively high-output cutting tool to utilize a low-output battery as apower source thereof.

A tabletop cutting device according to the present invention may includea table on which a cutting material is placed, and a cutting device mainbody that is operated in a vertically movable manner with respect to thetable and includes a circular rotary blade which is rotated by anelectric motor. Furthermore, the cutting device main body may include aplurality of battery attachment sections for attaching rechargeablebatteries such that the batteries are slidably attached to the batteryattachment sections.

According to the present invention, it is possible to use thehigh-output cutting tool by attaching two low-output batteries. Thus, itis possible to effectively utilize the low-output battery and to furtherimprove convenience and handling properties of the high-output cuttingtool.

As an attachable battery, a slidably-attachment-type battery, which canbe attached to the battery attachment section by engaging a pair of railreception sections provided on one surface of the battery with railsprovided on the battery attachment section side, can be applied.

In the tabletop cutting device according to a more preferable embodimentof the present invention, the plurality of the battery attachmentsections may be disposed side by side along a direction perpendicular toa plane of the rotary blade. According to the embodiment, it is possibleto attach the batteries at multiple locations in a surface direction ofthe rotary blade in a compact manner, and it is also possible to attachtwo batteries in the above-mentioned direction of the tabletop cuttingdevice without damaging the compactness.

The tabletop cutting device according to a still more preferableembodiment of the present invention may further include a biasing meansfor biasing the cutting device main body in an upward direction toward astandby position side. Furthermore, the cutting device main body may beconfigured to be returned to the standby position side such that weightof the batteries which are attached to the battery attachment sectionsserves as a weight. According to the embodiment, it is possible todecrease a biasing force for returning the cutting device main body tothe standby position in an upper direction. Accordingly, since it ispossible to decrease operational power for moving the cutting devicemain body downward against the biasing force, it is possible to improveoperability and workability of the tabletop cutting device.

In the tabletop cutting device according to a still more preferableembodiment of the present invention, the cutting device main body mayinclude a main grip part which a user holds when the user performs anup-down movement operation of the cutting device main body. The cuttingdevice main body may further include a sub grip part which is providedat an end portion of the main grip part on a side opposite to the user,and the sub grip part is placed parallel to a top surface of the tableand capable of being used for carrying the tabletop cutting device whenthe cutting device main body is held at a lower moving end. Furthermore,the plurality of the battery attachment sections may be disposed at anend portion of the sub grip part on a side opposite to the main grippart. According to the embodiment, the battery or the battery attachmentsections may not interfere with the user when the user holds the maingrip part or the sub grip part. Thus, it is possible to attach aplurality of the batteries without damaging operability and handlingproperties of the tabletop cutting device.

In the tabletop cutting device according to a still more preferableembodiment of the present invention, the cutting device main body may besupported so as to be operated in a vertically tiltable manner withrespect to the table. Furthermore, the cutting device main body may beconfigured such that a center of gravity of the cutting device main bodyis displaced to a side opposite to a vertical plane which passes througha tilting fulcrum of the cutting device main body in the course of thevertical tilting of the cutting device main body. According to theembodiment, it is possible that a weight of the cutting device main bodymay serve as an external force for locating and maintaining the cuttingdevice main body at both of the standby position in the upper portionand a lower moving end. Accordingly, it is possible to improveoperability when moving up and down the cutting device main body.

In the tabletop cutting device according to a still more preferableembodiment of the present invention, the plurality of the batteryattachment sections may be connected to the cutting device main body viaa power cord. According to the embodiment, it is possible to reduce theweight of the cutting device main body. Thus, it is possible to improveoperability when moving the cutting device main body in an upward anddownward direction.

In the tabletop cutting device according to a still more preferableembodiment of the present invention, the battery attachment sections towhich the batteries are attached may be utilized as an auxiliary tablehaving the same height as that of the table when the battery attachmentsection is placed on an installation surface on which the tabletopcutting device is placed. According to the embodiment, it is possiblethat the battery attachment section to which a battery is attached mayhave an additional function of an auxiliary table. Thus, it is possibleto improve functionality of the battery attachment section andeventually the tabletop cutting device.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a plan view of a tabletop cutting device of a firstembodiment.

FIG. 2 is a right-side view of the tabletop cutting device of the firstembodiment.

FIG. 3 is a view illustrating a state where two batteries arerespectively detached from a battery attachment section, viewed from anarrow (III) in FIG. 2.

FIG. 4 is a perspective view of a single battery unit.

FIG. 5 is a top view of the single battery unit when viewed from anarrow (V) in FIG. 4.

FIG. 6 is a rear view of the single battery unit when viewed from anarrow (VI) in FIG. 4.

FIG. 7 is a plan view of a tabletop cutting device of a secondembodiment.

FIG. 8 is a right-side view of the tabletop cutting device of the secondembodiment.

FIG. 9 is a plan view of a tabletop cutting device of a thirdembodiment.

FIG. 10 is a right-side view of the tabletop cutting device of the thirdembodiment.

FIG. 11 is a plan view of a tabletop cutting device of a fourthembodiment.

FIG. 12 is a right-side view of the tabletop cutting device of thefourth embodiment.

FIG. 13 is a plan view of a tabletop cutting device of a fifthembodiment.

FIG. 14 is a front view of the tabletop cutting device of the fifthembodiment.

FIG. 15 is a plan view of a tabletop cutting device of a sixthembodiment.

FIG. 16 is a right-side view of the tabletop cutting device of the sixthembodiment.

FIG. 17 is a right-side view of a tabletop cutting device of a seventhembodiment, illustrating a state where a cutting device main body isreturned to a standby position (upper dead point) in an upper portion.

FIG. 18 is a right-side view of the tabletop cutting device of theseventh embodiment, illustrating a state where the cutting device mainbody is operated to move downward to a downward movement end position(lower dead point).

FIG. 19 is a plan view of a tabletop cutting device of an eighthembodiment.

FIG. 20 is a right-side view of the tabletop cutting device of theeighth embodiment.

DESCRIPTION OF EMBODIMENTS

Next, first to eighth embodiments of the present invention will bedescribed with reference to FIGS. 1 to 20. The embodiments describedbelow are different from one another in the form of the attachment of abattery as a power source, and are the same in the basic configurationas a tabletop cutting device. In addition, since the embodimentsdescribed below are the same as the well-known configuration of therelated art, the same reference numerals and signs are applied thereto,and detailed descriptions will be omitted.

As illustrated in FIGS. 1 and 2, a tabletop cutting device C1 of thefirst embodiment may include a table 2 for fixing a cutting material Won a top surface, a base 3 for supporting the table 2 so as to berotatable within a certain range in a horizontal direction, a main bodysupport section 4 provided on a rear portion (a left end portion inFIG. 1) of the table 2, and a cutting device main body 10 supported bythe main body support section 4 above the table 2. A user is positionedon a left side of the tabletop cutting device C1 in FIGS. 1 and 2.

A positioning fence 5 for positioning the cutting material W on a tablesurface may be disposed on a top surface of the table 2. The positioningfence 5 may be fixed across auxiliary tables 3 a and 3 a provided on theright and left sides of the base 3. The top surface of the table 2 maybe disposed having a small gap so as to allow a horizontal rotation ofthe table 2. The cutting material W positioned by the positioning fence5 may be fixed along the top surface of the table 2 by a clamp device(not illustrated).

The main body support section 4 may include a pair of slide bars 6 and 6on the right and left sides for supporting a cutting device main body 10to be slidable in a horizontal direction with respect to the table 2, aright-left tilt supporting mechanism 7 for tilting the cutting devicemain body 10 to the right and left (in a direction orthogonal to a sheetin FIG. 2) when viewed from a user, and a main body supporting arm 8 forsupporting the cutting device main body 10 so as to be verticallytiltable via a vertically tilting shaft 9. The cutting device main body10 may be supported to be slidable in a front-rear direction along atable surface direction via the slide bars 6 and 6. Cutting direction ofthe cutting material W (cutting/advancing direction) may correspond tothe sliding direction of the cutting device main body 10 toward a reardirection by both the slide bars 6 and 6. It may be possible to fix aslide position of the cutting device main body 10 by tightening a fixingscrew 6 a.

The right-left tilt supporting mechanism 7 may include a tilt basesection 7 b which is attached to the rear portion of the table 2 and atiltable section 7 d which is joined so as to be relatively rotatablewith respect to the tilt base section 7 b via the right-left tiltingshaft 7 c. A main body supporting arm 8 may be provided on an upperportion of the tiltable section 7 d. It may be possible to fix thetiltable section 7 d to the tilt base section 7 b so as not torelatively rotatable by tightening a fixing lever 7 a attached to a rearend portion of the right-left tilting shaft 7 c and tightening a screwportion provided in the right-left tilting shaft 7 c. Accordingly, itmay be possible to fix the cutting device main body 10 to aperpendicular-cutting position or a right or left tilting position.

The main body supporting arm 8 is curbed in an L-shape, and a main bodycase 11 of the cutting device main body 10 may be supported on a curbedtip end side in a vertically tiltable manner via the vertically tiltingshaft 9. This main body case 11 may cover a substantially semicirculararea of an upper side of a circular rotary blade 12. The rotary blade 12may be attached to a spindle (not illustrated). The spindle may berotatably supported by the main body case 11, and may be rotated with anelectric motor 13 and a reduction gear unit 18 which are attached to arear surface side (right side surface) of the main body case 11.

As illustrated in FIG. 2, a substantially semicircular area of a lowerside of the rotary blade 12 may be configured to be covered by a movablecover 16. The movable cover 16 may be opened and closed by interlockingwith a vertically tilting operation of the cutting device main body 10via a link mechanism (not illustrated). As illustrated in FIG. 2, whenthe cutting device main body 10 is positioned at an upper dead point,the movable cover 16 is closed, and when the cutting device main body 10is tilted downward, the movable cover 16 may be rotated in a clockwisedirection in FIG. 2 and gradually opened.

The cutting device main body 10 may be configured to be biased in anupper tilting direction by a torsion spring (not illustrated) attachedto a periphery of the vertically tilting shaft 9. The user can perform acutting processing by carrying out a pressing-down operation of thecutting device main body 10 against the biasing force. When thepressing-down operation of the cutting device main body 10 is released,the cutting device main body 10 may be returned to a standby position(upper dead point) in an upper direction by the biasing force.

A large-sized handle section 20 held by a user may be provided in thevicinity of a connecting portion of an electric motor 13 and a reductiongear unit 18 in a rear surface side of the main body case 11. The handlesection 20 may be provided with a front side main grip part 21 and arear side sub grip part 22. When the user holds the front side main grippart 21 and performs a pulling operation of a trigger-type switch lever23 with a fingertip, the electric motor 13 may be activated to rotatethe rotary blade 12. In addition, when the user holds the main grip part21 and tilts the cutting device main body 10 downward, the cuttingmaterial W can be cut into with the rotary blade 12. Furthermore, theuser can slide the cutting device main body 10 in a cutting/advancingdirection while holding the main grip part 21.

The sub grip part 22 may extend to a direction of being curbed in anL-shape toward the main grip part 21. When the cutting device main body10 is positioned at a lower dead point, the sub grip part 22 may beplaced in a substantially parallel position with respect to a tablesurface direction. The sub grip part 22 may function as a carryinghandle when the cutting device main body 10 is fixed to the lower deadpoint to carry the tabletop cutting device C1.

Two batteries 31 and 31 may be attached to a rear end portion of thehandle section 20 in a rear portion of the sub grip part 22 via abattery base 30. The battery base 30 may have a flat plate shape in avertical and horizontal directions in the vicinity of a joint part of ahandle arm 24 extending from a rear surface of the electric motor 13 anda rear portion of the sub grip part 22. As illustrated in FIG. 3, twobattery attachment sections 32 and 32 may be provided on a rear surfaceof the battery base 30. The two battery attachment sections 32 and 32may be disposed laterally aligned (parallel) in a horizontal direction.An 18V battery 31 may be attached on each of the battery attachmentsections 32 and 32. In this embodiment, a lithium-ion battery whichhouses multiple cells can be attached to the battery case. The 18Vbatteries 31 and 31 may be slidably-attachment-type batteries used as apower source of other electric tools such as an electric screwdriveretc., and can be used among the tabletop cutting device C1. In addition,the batteries 31 and 31 can be detached from battery attachment sections32 and 32 and used as a repeatedly usable power source by being chargedwith a separately prepared charger.

As illustrated in FIGS. 4 to 6, a pair of rail reception sections 31 aand 31 a may be provided on right and left sides of a top surface of thebattery 31 having a cuboid shape. Positive and negative terminalreception sections 31 b and 31 c may be disposed between both the railreception sections 31 a and 31 a. Between the positive and negativeterminal reception sections 31 b and 31 c, a connector section 31 d maybe provided for transmitting and receiving a control signal to and froma battery charger when performing charging with the charger. Inaddition, a lock claw 31 e may be provided on a rear portion of an uppersurface of the battery 31. The lock claw 31 e may be spring-urged in adirection protruding upward. The lock claw 31 e can be moved to anunlocked position in a lower direction against the spring-biased forceby performing a pressing operation of an unlock button 31 f provided ona rear surface with a fingertip.

As illustrated in FIG. 3, both the battery attachment sections 32 and 32may have the same configuration. In addition, both the batteryattachment sections 32 and 32 may be electrically connected to eachother in series. The pair of left and right rail sections 32 a and 32 amay be provided on the battery attachment section 32. Positive andnegative connection terminals 32 b and 32 c may be disposed between boththe rail sections 32 a and 32 a. An engagement concave section 32 d withwhich the lock claw 31 e (refer to FIG. 4) of the battery 31 is engagedmay be provided on an upper portion (illustrated) of each of the batteryattachment sections 32.

As illustrated in FIG. 3, by sliding the battery 31 downward (paralleltranslation) as illustrated with respect to the battery attachmentsection 32 while engaging the rail reception sections 31 a and 31 a withthe rail sections 32 a and 32 a, it may be possible to mechanically linkthe battery 31 to the battery attachment section 32. When the battery 31is mechanically linked to the battery attachment section 32, connectionterminals 32 b and 32 c on the battery attachment section 32 side may beinserted into terminal reception sections 31 b and 31 c on the battery31 side to be electrically connected therewith. In addition, when thebattery 31 is mechanically linked to the battery attachment section 32,the lock claw 31 e may be engaged with the engagement concave section 32d and locked in an attachment state where the battery 31 is fixed in anon-movable state in a sliding direction. In this specification,slidably-attachment-type batteries 31 and 31 mean a battery which can beattached to the battery attachment section 32 by moving the battery inparallel with the battery attachment section 32 while rail sections 32 aand 32 a on the battery attachment section 32 side being engaged withthe pair of rail reception sections 31 a and 31 a provided on onesurface (upper surface) of the battery.

In order to detach the attached battery 31 from the battery attachmentsection 32, the battery 31 in FIG. 3 may be pulled upward while theunlock button 31 f is pressed downward. Accordingly, the rail receptionsections 31 a and 31 a may be removed from the rail sections 32 a and 32a, the connection terminals 32 b and 32 c are separated from theterminal reception sections 31 b and 31 c, and the battery 31 may bedetached from the battery attachment section 32. In this way, since anattachment and a detachment direction of the batteries 31 and 31 may bea vertical direction, the user can easily attach and detach thebatteries 31 and 31 to and from the battery attachment sections 32 and32. In addition, since the batteries 31 and 31 are configured to bedetached by being slid upward, it may be possible to prevent thebatteries 31 and 31 from accidentally falling due to a carelessattachment operation.

When two of the 18V batteries 31 and 31 are attached to the batteryattachment sections 32 and 32 provided as described above, both thebatteries 31 and 31 may be electrically connected in series and become apower source outputting a rated voltage 36V which is a total voltage.The power source of the rated voltage 36V which is output from thebatteries 31 and 31 may activate the electric motor 13, thereby rotatingthe rotary blade 12.

As illustrated in FIG. 2, when the cutting device main body 10 ispositioned at the upper dead point, a center of gravity G of thebatteries 31 and 31 may be positioned on a rear side with respect to avertical surface (a reference line J) passing a vertically tiltingcenter (the shaft center of a vertically tilting shaft 9) of the cuttingdevice main body 10. On the contrary, when the cutting device main body10 is positioned at the lower dead point, the center of gravity G of thebatteries 31 and 31 may be positioned at a front side with respect tothe reference line J. For this reason, the center of gravity G of thebatteries 31 and 31 may be displaced from the rear side to the frontside with respect to the reference line J corresponding to a downwardmovement operation of the cutting device main body 10. On the otherhand, the center of gravity G of the batteries 31 and 31 may bedisplaced from the front side to the rear side with respect to thereference line J corresponding to an upward movement operation of thecutting device main body 10.

When the cutting device main body 10 is positioned at the upper deadpoint and the center of gravity G of the batteries 31 and 31 ispositioned on the rear side with respect to the reference line J, theweight of the batteries 31 and 31 may serve as an external force (aweight) for positioning and maintaining the cutting device main body 10to the upper dead point. For this reason, it may be possible to reducethe biasing force of biasing means (torsion spring) for biasing thecutting device main body 10 to a standby position side in an upperdirection, by that amount. Thus, it may be possible to reduce the sizeof the biasing means.

In the course of moving the cutting device main body 10 downward, thecenter of gravity G of the batteries 31 and 31 may be displaced to thefront side with respect to the reference line G, and the weight of boththe batteries 31 and 31 may serve as an external force (a weight) formoving the cutting device main body 10 downward, and accordingly serveas a force partially canceling the biasing force of the torsion spring.Because of this, at this time, it may be possible to obtain a sufficientpressing force (cutting force) of the rotary blade 12 with respect tothe cutting material W while reducing a pressing operation force of theuser. In this regard, it may be possible to improve workability of thetabletop cutting device C1.

As illustrated in FIGS. 1 and 2, in a rear portion of the handle section20, a handle arm 24 extending from a rear surface to a rear direction ofthe electric motor 13 may be provided such that a controller-housingpart 25 extends in a lateral direction. A controller including a powersupply circuit and a motor control circuit may be housed in thecontroller-housing part 25. Cooling air produced by the electric motor13 may be blown into the controller housing part 25 so as to cool thecontroller.

Referring now to FIG. 1, a center of the battery 31 on the left side maycoincide with a center of the handle section 20 in a lateral widthdirection. In addition, in a plane view, the battery 31 on the rightside may be disposed in a position protruding from the handle section 20in a right side direction by substantially the same distance as theelectric motor 13.

According to the tabletop cutting device C1 of the first embodimentconfigured as described above, a 36V type tabletop cutting device C1having the electric motor 13 of the rated voltage 36V as a drivingsource can use two 18V-type batteries 31 and 31 as a power source,instead of using one 36V-type battery. Because of this, the user can usethe 18V batteries 31 and 31, which the user already have as a powersource of 18V-type electric tools, as a power source of the 36V-typetabletop cutting device C1. In this way, it may be possible to furtherimprove convenience and handling property (usability) of the 36V-typetabletop cutting device C1 as well as to reduce costs of the batteries.

A tabletop cutting device C2 of a second embodiment is illustrated inFIGS. 7 and 8. As illustrated in FIG. 8, the tabletop cutting device C2of the second embodiment is different from the first embodiment in thatthe tabletop cutting device C2 is provided with only a main grip part 21and not provided with a sub grip part 22 for carrying. A pedestal framesection 40 may be provided on a rear portion of a handle section 20 soas to protrude from a rear surface of an electric motor 13 in a reardirection. Battery attachment sections 32 may be provided on a topsurface and a rear surface of the pedestal frame section 40. It may bepossible to attach 18V battery 31 to the battery attachment section 32on a top surface side and to the battery attachment section 32 on a rearsurface side, respectively. Similar to the first embodiment, two 18Vbatteries 31 and 31 may be electrically connected in series and serve asa power source of the rated voltage 36V.

Because of this construction, according to the tabletop cutting deviceC2 of the second embodiment, it may be also possible to use the 36V-typetabletop cutting device C2 by utilizing 18V batteries 31 and 31 whichare highly prevalent.

As illustrated in an outlined arrow in FIG. 8, in the second embodiment,the attaching direction of the battery 31 on the top surface side may bea direction obliquely upward to the front, and the attaching directionof the battery 31 on the lower side is a direction obliquely downward tothe front.

A tabletop cutting device C3 of a third embodiment is illustrated inFIGS. 9 and 10. The tabletop cutting device C3 of the third embodimentis different from those of the first and the second embodiments in thattwo batteries 31 and 31 are attached in a direction of mutually facing atop surface (joint part of the battery attachment sections). As in thesecond embodiment, in the tabletop cutting device C3 of the thirdembodiment, a pedestal frame section 40 may be provided on a rearportion of a handle section 20 so as to protrude in a rear direction. Abattery base 41 may be provided so as to protrude from a top surface ofthe pedestal frame section 40 in a right side direction. Two batteryattachment sections 32 and 32 may be provided on the top surface of thebattery base 41 in a mutually back-to-back state.

One 18V battery 31 may be attached along a left side surface of abattery attachment section 32 on an upper side (left side) in FIG. 9. Inaddition, one 18V battery 31 may be attached along a right side surfaceof the battery attachment section 32 on a lower side (right side) inFIG. 9. As illustrated in an outlined arrow in FIG. 10, the attachingdirection of the two batteries 31 and 31 may be a direction obliquelydownward to the front at an upper dead point of the cutting device mainbody 10. In the tabletop cutting device C3 of the third embodiment, itmay be also possible to use the 36V-type tabletop cutting device C3 byutilizing 18V batteries 31 and 31 which are highly prevalent.

A tabletop cutting device C4 of a fourth embodiment is illustrated inFIGS. 11 and 12. The tabletop cutting device C4 of the fourth embodimentis different from the tabletop cutting device in the third embodiment inthe attaching direction of two batteries 31 and 31. A pedestal framesection 40 may be provided in a rear portion of a handle section 20 soas to protrude in a rear direction. A battery base 42, which protrudesin a right side direction further than in the third embodiment, may beprovided on a top surface of a pedestal frame section 40. Two batteryattachment sections 32 and 32 may be provided on the top surface of thebattery base 42 in a mutually back-to-back state.

One 18V battery 31 may be attached along a left side surface of thebattery attachment section 32 on an upper side (left side) in FIG. 11.One 18V battery 31 may be attached along a right side surface of thebattery attachment section 32 on a lower side (right side) in FIG. 11.As illustrated in an outlined arrow in FIG. 12, the attaching directionof two batteries 31 and 31 may be a direction obliquely upward to thefront at an upper dead point of the cutting device main body 10. In thetabletop cutting device C4 of the fourth embodiment, it may be alsopossible to use the 36V-type tabletop cutting device C4 by utilizing 18Vbatteries 31 and 31 which are highly prevalent.

A tabletop cutting device C5 of a fifth embodiment is illustrated inFIGS. 13 and 14. The tabletop cutting device C5 of the fifth embodimentis different from the tabletop cutting devices of the first to fourthembodiments in that two batteries 31 and 31 may be configured to beremotely connected to a cutting device main body 10 via a power cord 50.

In the third embodiment and the fourth embodiment, the battery bases 41and 42 may be integrally provided in the pedestal frame section 40. Inthe fifth embodiment, a battery base 51 may be separated from a pedestalframe section 40. The battery base 51 may be connected to the pedestalframe section 40 via one power cord 50. The power cord 50 may be pulledinto the pedestal frame section 40 and electrically connected to a powersource circuit (controller). Two battery attachment sections 32 and 32may be disposed side by side in the battery base 51 remotely connectedvia the power cord 50. Two 18V batteries 31 can be attached to each ofthe battery attachment sections 32 and 32.

As illustrated in FIG. 14, the power cord 50 may have a sufficientlength such that the two attached batteries 31 and 31 are placed on thesame workbench F on which the tabletop cutting device C5 is placed. Arear surface (a side that is not provided with battery attachmentsections 32 and 32, which is a top surface illustrated in the figure) 51a of the battery base 51 may have an accurately machined flat surface.In addition, the plate thickness of the battery base 51 may beconfigured such that the rear surface 51 a of the battery base 51 mayhave a height H from an installation surface, and the rear surface 51 amay be flush with the surface of auxiliary tables 3 a and 3 a of a base3 when two batteries 31 and 31 attached to the battery attachmentsections 32 and 32 are placed on the work bench F, as illustrated inFIG. 14.

As illustrated in the figure, by directing the rear surface 51 a of thebattery base 51 upward and placing the two batteries 31 and 31 on thework bench F so as to be adjacent to the auxiliary table 3 a on oneside, the rear surface 51 a of the battery base 51 may serve as anauxiliary table which can complement the auxiliary tables 3 a and 3 a.In this way, it may be possible to place a larger cutting material W ina more stable manner.

In this way, in the tabletop cutting device C5 of the fifth embodiment,it may be also possible to use the 36V-type tabletop cutting device C5by utilizing two 18V batteries 31 and 31 which are used as a powersource of other electric tools and are highly prevalent. Accordingly,compared to a case of using one 36V battery, it may be possible toimprove convenience and handling property of the 36V-type tabletopcutting device C5 as well as to reduce costs of the batteries.

In addition, according to the tabletop cutting device C5 of the fifthembodiment, it may be possible that the battery base 51 for attachingthe two batteries 31 and 31 may have both a battery attachment functionand a function as an auxiliary table. In this regard, it may be possibleto further increase added value of the tabletop cutting device C5.

A tabletop cutting device C6 of a sixth embodiment is illustrated inFIGS. 15 and 16. Similar to the tabletop cutting device in the second tofourth embodiments, the tabletop cutting device C6 of the sixthembodiment may be configured to be capable of attaching two batteries 31and 31 to a pedestal frame section 40 provided on a rear portion of ahandle section 20. In the tabletop cutting device C6 of the sixthembodiment, two batteries 31 and 31 may be aligned in a front-reardirection, and are vertically attached such that an attaching anddetaching direction may be a vertical direction.

A battery base 43 may be provided in the pedestal frame section 40provided on a rear portion of the handle section 20 so as to protrude ina right side direction. The longitudinal direction of the battery base43 may be along the front-rear direction (in a direction in which thepedestal frame section 40 extends). Two battery attachment sections 32and 32 may be attached to a top surface of the battery base 43 so as tostand and protrude in an upward direction, being disposed side by sideat a predetermined distance with each other. As illustrated in FIG. 16,when the cutting device main body 10 is positioned at an upper deadpoint, batteries 31 may be respectively attached to each batteryattachment sections 32 and 32 by being slid obliquely downward to thefront. Although not illustrated, when the cutting device main body 10 ismaintained at an end position of downward movement, the attachingdirection of both the batteries 31 and 31 may be substantially avertical direction.

FIGS. 17 and 18 illustrate a tabletop cutting device C7 of a seventhembodiment. The tabletop cutting device C7 is different from theabove-described sixth embodiment in the attaching direction of the twobatteries 31 and 31, and other configurations are the same as those inthe sixth embodiment. In the sixth embodiment, when the cutting devicemain body 10 is positioned at an upper dead point, the attachingdirection of the batteries 31 and 31 may be a direction obliquelydownward to the front as illustrated in FIG. 16. However, in the seventhembodiment, the attaching direction may be a direction obliquely upwardto the front as illustrated in FIG. 17. In addition, in the sixthembodiment, when the cutting device main body 10 is positioned at thelower dead point, the attaching and detaching direction of the batteries31 and 31 may be a vertical direction. However, in the seventhembodiment, the attaching and detaching direction of the batteries 31and 31 may be a horizontal direction as illustrated in FIG. 18.

In the seventh embodiment, a battery base 44 may be provided in apedestal frame section 40 provided on a rear portion of a handle section20. The longitudinal direction of the battery base 44 may be along avertical direction (in a direction orthogonal to a direction in whichthe pedestal frame section 40 extends). Two battery attachment sections32 and 32 may be respectively attached to the rear surface of thebattery base 44 so as to protrude in a rearward direction, beingdisposed side by side at two upper and lower steps at a predetermineddistance from each other. Two 18V batteries 31 and 31 may berespectively attached to a lower surface side of each of the batteryattachment sections 32 and 32.

FIGS. 19 and 20 illustrate a tabletop cutting device C8 of a eighthembodiment. In the eighth embodiment, a battery base 45 may be providedin the right-left tilt supporting mechanism 7 that may be composed of amain body support section 4. The battery base 45 may be provided so asto rise in an upward direction across a tiltable section 7 d of theright-left tilting mechanism 7 and a main body supporting arm 8. Asillustrated in FIG. 20, two battery attachment sections 32 and 32 may berespectively attached to the rear surface of the battery base 45,protruding in a rearward direction and being disposed at two upper andlower steps at a predetermined distance from each other. Two 18Vbatteries 31 and 31 may be respectively attached to the lower surfaceside of the battery attachment sections 32 and 32. Each of the batteries31 and 31 can be attached by being slid toward the front as illustratedin an outlined arrow in FIG. 20.

In the eighth embodiment, the attaching direction of the batteries 31and 31 may be fixed in a horizontal direction in a side view at an upperdead point position and also at a lower dead point position of thecutting device main body 10. In this respect, the eighth embodiment isdifferent from the sixth embodiment and the seventh embodiment. In theeighth embodiment, even if the cutting device main body 10 is verticallydisplaced in a cutting work, the positions of the batteries 31 and 31,and the battery attachment sections 32 and 32 may not change. However,when the cutting device main body 10 is tilted to the left or the rightby the right-left tilt supporting mechanism 7, the batteries 31 and 31and the battery attachment sections 32 and 32 may be displaced to theleft direction or the right direction, accordingly.

In the tabletop cutting devices C6, C7, and C8 according to the sixth toeighth embodiments configured as described above, it may be possible touse the 36V-type tabletop cutting devices C6, C7, and C8 by utilizingtwo 18V batteries 31 and 31 which are used as a power source of otherelectric tools. In this way, compared to a case where one 36V battery isprepared, it may be possible to improve convenience and handlingproperty of the 36V-type tabletop cutting devices C6, C7, and C8 as wellas to reduce costs of the batteries.

In the above-described first to eighth embodiments, furthermodifications can be implemented. For example, tabletop cutting devicesC1 to C8 capable of sliding the cutting device main body 10 in thefront-rear direction are exemplified. However, it may be possible toobtain the same operational effect by using two 18V batteries connectedin series as a power source of the rated voltage 36V-type electric motor13 in a tabletop cutting device in which a slide function is notincluded and the cutting device main body can be simply moved in avertical direction to perform a cutting work.

In the above, the configuration of attaching the two 18V batteries 31and 31 is exemplified. However, it may be possible to attach Nlithium-ion batteries of the rated voltage nV in series and to use thebatteries as power sources of output voltage (n×N)V.

Furthermore, the rear portion of the handle section 20 is mainlyexemplified as a position of attaching the two 18V batteries 31 and 31,in consideration of workability at the time of a cutting work. However,a configuration may be employed in which a battery attachment section 32is provided on the side portion or the inner portion of the right-leftauxiliary tables 3 a and 3 a, and multiple batteries can be attachedthereto. By attaching multiple batteries 31 to 31 on the base 3 side, itmay be possible to improve stability of installation state of thetabletop cutting device and improve workability and handling propertiesof the tabletop cutting device at the time of a cutting work.

1. A tabletop cutting device comprising: a table on which a cuttingmaterial is placed; and a cutting device main body that is operated in avertically movable manner with respect to the table and includes acircular rotary blade which is rotated by an electric motor, wherein thecutting device main body includes a plurality of battery attachmentsections for attaching rechargeable batteries such that the batteriesare slidably attached to the battery attachment sections.
 2. Thetabletop cutting device according to claim 1, wherein the plurality ofthe battery attachment sections are disposed side by side along adirection perpendicular to a plane of the rotary blade.
 3. The tabletopcutting device according to claim 1, further comprising: a biasing meansfor biasing the cutting device main body in an upward direction toward astandby position side, wherein the cutting device main body isconfigured to be returned to the standby position side such that weightof the batteries which are attached to the battery attachment sectionserves as a weight.
 4. The tabletop cutting device according to claim 1,further comprising: a main grip part which a user holds when the userperforms an up-down movement operation of the cutting device main body;and a sub grip part which is provided at an end portion of the main grippart on a side opposite to the user, the sub grip part being placedparallel to a top surface of the table and capable of being used forcarrying the tabletop cutting device when the cutting device main bodyis held at a lower moving end, wherein the plurality of the batteryattachment sections are disposed at an end portion of the sub grip parton a side opposite to the main grip part.
 5. The tabletop cutting deviceaccording to claim 1, wherein: the cutting device main body is supportedso as to be operated in a vertically tiltable manner with respect to thetable; and the cutting device main body is configured such that a centerof gravity of the cutting device main body is displaced to a sideopposite to a vertical plane which passes through a tilting fulcrum ofthe cutting device main body in the course of the vertical tilting ofthe cutting device main body.
 6. The tabletop cutting device accordingto claim 1, wherein the plurality of the battery attachment sections areconnected to the cutting device main body via a power cord.
 7. Thetabletop cutting device according to claim 6, wherein the batteryattachment sections to which the batteries are attached are utilized asan auxiliary table having the same height as that of the table when thebattery attachment section is placed on an installation surface on whichthe tabletop cutting device is placed.